Abstract The radio–X-ray correlation and Fundamental Plane (FP) of black hole activity can serve as a diagnostic tool for the origin of X-ray emissions. There was a scaling relation between radio and X-ray emissions for High-synchrotron-peaked BL Lacertae objects (HBLs), i. e. , L ₑ L ₗ^0. 64, which can be explained by ADAF-dominated mode or synchrotron cooling (Syn-c). However, many results of studying blazar physics show that the X-ray emissions of HBLs are mainly produced by the synchrotron process of jets. Therefore, Syn-c appears to provide a plausible explanation for this relation. To further clarify the origin of X-ray emissions of HBLs, we constructed a sample containing 69 HBLs in this paper to re-investigate their radio–X-ray correlation and FP. Considering the Doppler beaming effect, we find that the intrinsic radio–X-ray correlation and FP of HBLs are L ₑ, ₈₍ₓ L ₗ, ₈₍ₓ^0. 68 and log LR, int = (0. 57 ± 0. 06) log LX, int + (0. 33 ± 0. 11) log MBH + (12. 65 ± 2. 00), respectively. Our results agree with the scaling relation mention above, which suggests these scaling relations are not artificial. By employing the theoretical model of Syn-c, we find that these shallow radio–X-ray correlations and FP are caused by Syn-c, which implies that the X-ray emissions of HBLs may be produced by rapidly cooling, high-energy electrons accelerated at a shock. This is consistent with results of the recent X-ray polarization observations of HBLs. Our results provide the observational evidence of L ₑ L ₗ_ₒₘ₍-₂^0. 6 0. 7.
Long et al. (Sat,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: